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Leaf Chains comprise different applications and are regulated by ANSI. They are used for lift truck masts, for low-speed pulling and tension linkage, and as balancers between counterweight and head in some machine tools. Leaf chains are at times also referred to as Balance Chains.
Construction and Features
Leaf chains are actually steel chains with a simple pin construction and link plate. The chain number refers to the pitch and the lacing of the links. The chains have particular features such as high tensile strength per section area, which allows the design of smaller mechanisms. There are B- and A+ kind chains in this particular series and both the AL6 and BL6 Series have the same pitch as RS60. Lastly, these chains cannot be driven with sprockets.
Handling and Selection
Comparably, in roller chains, all of the link plates maintain higher fatigue resistance because of the compressive stress of press fits, while in leaf chains, only two outer plates are press fit. The tensile strength of leaf chains is high and the maximum acceptable tension is low. Whenever handling leaf chains it is important to check with the manufacturer's manual to be able to guarantee the safety factor is outlined and utilize safety guards at all times. It is a good idea to exercise extreme caution and utilize extra safety measures in functions wherein the consequences of chain failure are severe.
Utilizing a lot more plates in the lacing leads to the higher tensile strength. In view of the fact that this does not enhance the maximum acceptable tension directly, the number of plates utilized may be limited. The chains need regular lubrication since the pins link directly on the plates, generating a very high bearing pressure. Making use of a SAE 30 or 40 machine oil is often advised for nearly all applications. If the chain is cycled more than 1000 times day after day or if the chain speed is more than 30m for each minute, it would wear extremely rapidly, even with continual lubrication. Therefore, in either of these conditions the use of RS Roller Chains will be more suitable.
AL type chains are only to be used under particular conditions such as where there are no shock loads or if wear is not really a big problem. Be certain that the number of cycles does not go beyond 100 day after day. The BL-type will be better suited under other situations.
If a chain with a lower safety factor is chosen then the stress load in components would become higher. If chains are utilized with corrosive elements, then they could become fatigued and break rather easily. Performing frequent maintenance is essential if operating under these types of situations.
The kind of end link of the chain, whether it is an outer link or inner link, determines the shape of the clevis. Clevis connectors or likewise called Clevis pins are constructed by manufacturers but normally, the user supplies the clevis. A wrongly constructed clevis can reduce the working life of the chain. The strands must be finished to length by the producer. Check the ANSI standard or phone the maker.
In the new millennium, Skyjack was acquired by the Linamar Corporation, who is LNR on the TSX, a primary maker of modules, assemblies and precision-machined components. At present, Skyjack has manufacturing facilities in the US, Canada and Hungary with extra support offices in Europe and Asia.
The Skyjack brand name became the industry leader for aerial lift truck machinery by combining features like for instance durability, quality and serviceability, making their own scissor hoists recognized all over the globe for product reliability and efficiency. Skyjack makes many other self propelled aerial platform lifts for its global customer base. Their elevated work heights reach nearly 56 feet. The company`s present Boom lift model series has telescopic booms ranging from forty five feet to seventy one feet. Skyjack has plans to further develop their boom lift product line. The company is still a leading player in the industry adjusting rapidly to the constantly evolving needs of all their customers.
Skyjack`s acquisition of Carelift Equipment was completed in August of the year 2007. Most recently, their acquisition of Volvo`s Material Handling Equipment company expands Skyjack`s Telehandler product offering. The resulting VR series telehandlers and Zoom Boom together with the extra production capability further ensures the company`s growth and success.
